[AskStPhilomena]

"The specific form of the liturgy is something within the power of the Pope to regulate, so long as the essence of the Eucharistic sacrifice is maintained"

Here's a book by an eminent doctor of sacred theology (Rev Fr. Trinchard) that may interest you...
http://www.maeta.com/
Whether invalid or not, the short answer to the novus ordo is NO!

[sinkspur]

"Celebrated in the vernacular, the New Mass is more suitable to man, but disobedient to God and, therefore, conclusively invalid," Father Trinchard continues.

Trichard, a priest who celebrated the Novus Ordo his entire priesthood now, in his dotage, decides that it's invalid.

Oh, and Phil, he's not a "doctor." He has a licentiate, which means he couldn't quite cut the cut the doctoral mustard.

[sinkspur]

"Christ instituted the Mass to be as He instituted in perpetuity – forever – period," Father Trinchard says.

This is hilarious.

If Christ's Last Supper is the determinent, the Novus Ordo much more closely resembles the Eucharist of the Early Church, according the Didache, 155 A.D., than does the Mass of Pius V.

The only endorsement we see on the book jacket is from the agent of Malachi Martin.

I guess Maeta couldn't get Martin's third cousin, twice removed, to comment.